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High-temperature superconductivity: The roles of soft-phonon driven structural phase transitions and biphonon-electron coupling

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Zeitschrift für Physik B Condensed Matter

Abstract

For the first time, fully self-consistent soft phonon data, associated with the tetragonal-orthorhombic structural transition in the high-temperature superconductor La2−x Sr x CuO4, are used to solve Eliashberg equations. It is found that the electron-phonon coupling constant is stronglyx- and temperature-dependent. The superconducting transition temperatureT c follows the experimentalx-dependence but does not exceed 28 K. The higherT c values observed are attributed to nonlinear electronphonon interactions, due to high oxygen ion polarizability, which producebiphonon resonances and bound states and significantly increaseT c .

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Authors and Affiliations

  1. Max Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, W-7000, Stuttgart 80, Federal Republic of Germany

    Annette Bussmann-Holder

  2. University of Bayreuth, W-8580, Bayreuth, Federal Republic of Germany

    Annette Bussmann-Holder

  3. Theoretical Division and Advanced Studies Program in High-Temperature Superconductivity, Los Alamos National Laboratory, 87545, Los Alamos, NM, USA

    A. R. Bishop

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  1. Annette Bussmann-Holder
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Bussmann-Holder, A., Bishop, A.R. High-temperature superconductivity: The roles of soft-phonon driven structural phase transitions and biphonon-electron coupling. Z. Physik B - Condensed Matter 86, 183–186 (1992). https://doi.org/10.1007/BF01313824

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  • DOI: https://doi.org/10.1007/BF01313824

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